Changeset: 47895813
Alligned island to Bing
Closed by Kate Diaz
Tags
created_by | JOSM/1.5 (11826 en) |
---|---|
source | Bing |
Discussion
-
Comment from SomeoneElse
Hello,
As explained previously (see https://www.openstreetmap.org/changeset/44699065 ) Bing imagery may be out of date or offset. Can you explain what steps that you took here and in your other changesets in order ensure that this was not a problem?
Best Regards,
Andy -
Comment from Kate Diaz
Hi Andy,
Thanks for the comment. Do you have any resources that indicate that Bing is offset here or that the island has changed?
https://overpass-api.de/achavi/?changeset=47895813
I believe that the island now better reflects reality due to my edits and that these changes improve the map incrementally.
Thanks again,
Kate -
Comment from TheSwavu
Bing imagery in this area is off by 4 to 5 m.
-
Comment from SomeoneElse
Re "resources that indicate that Bing is offset here" I'd offer "experience".
Various things can be used to determine a Bing offset - underlying GPS traces and other imagery layers among them. I've certainly used the AGRI imagery together with GPS traces (my own and others) in WA to help align the more detailed Bing imagery.
The problem with detailed mapping based on poor input is something that looks right, but is entirely in the wrong place - and that makes it really difficult for future OSM mappers to correct (that's my experience based on early well-intentioned over-detailed mapping in OSM in the UK).
You seem (as suggested by http://www.openstreetmap.org/user/Kate%20Diaz/history ) to be mapping prolifically worldwide and there have been problems highlighted by other mappers worldwide (see http://resultmaps.neis-one.org/osm-discussion-comments?uid=4803527 ). What I'd suggest instead is that you concentrate on mapping in your local area first, and where there are verifiable imagery sources.
Finally, it's definitely worth reading https://wiki.openstreetmap.org/wiki/Imagery_Offset_Database which explains how imagery offsets can be stored and used. It's not the complete answer though, as imagery offsets can change over very short distances, especially in hilly areas.
Ways (2)
Welcome to OpenStreetMap!
OpenStreetMap is a map of the world, created by people like you and free to use under an open license.
Hosting is supported by Fastly, OSMF corporate members, and other partners.
https://openstreetmap.org/copyright | https://openstreetmap.org |
Copyright OpenStreetMap and contributors, under an open license |